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A new timing synchronization approach for OFDM systems
, Article International Congress on Ultra Modern Telecommunications and Control Systems and Workshops, 5 October 2011 through 7 October 2011, Budapest ; 2011 ; 21570221 (ISSN) ; 9781457706820 (ISBN) ; Shayesteh, M. G ; Sharif University of Technology
Abstract
In this paper, we propose a novel timing synchronization method for Orthogonal Frequency Division Multiplexing (OFDM) systems. The new method takes advantage of symmetrical correlation between some parts of the transmitted training symbol and produces an impulse-like timing metric. While reducing the complexity, our method provides an easy and efficient way for timing estimation. The proposed method does not need any differential cross-correlation or frequency correction to produce an impulse-like timing metric. It is shown that the new timing metric outperforms the previously presented methods in fading channels
Robust timing and frequency synchronization for OFDM systems
, Article IEEE Transactions on Vehicular Technology ; Volume 60, Issue 8 , Oct , 2011 , Pages 3646-3656 ; 00189545 (ISSN) ; Shayesteh, M. G ; Sharif University of Technology
2011
Abstract
This paper deals with timing and frequency synchronization in orthogonal frequency-division multiplexing (OFDM) systems. A robust multistage scheme that works in the time domain, independent of the preamble structure, is proposed. After coarse-timing estimation, joint timing and integer frequency synchronization is performed. Then, fractional frequency correction is carried out, and finally, fine-timing estimation completes the synchronization process. The new timing estimation method is flexible and can be adjusted according to the degree of channel distortion. Furthermore, frequency synchronization is efficiently accomplished with an estimation range that is as large as the bandwidth of...
Multiuser power allocation in downlink of cooperative CDMA networks
, Article IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC, 13 September 2009 through 16 September 2009 ; 2009 ; 9781424451234 (ISBN) ; Jafarnia, A ; Sharif University of Technology
Abstract
In this paper, we study the downlink of cooperative Direct-Sequence Code Division Multiple Access (DS-CDMA) systems, where a set of Mobile Terminals (MT) cooperate with the purpose of improving their downlink communications reliability with the Base Station (BS). For combating Multiple-Access Interference (MAI) as well as transferring complexity and spatial processing from the mobile terminals to the transmitter of BS, multiuser transmitter precoding is considered. In addition to multiuser precoding based on Minimum Mean-Square Error (MMSE) criterion for mitigating MAI, the proper transmission power control strategy under a fixed total power constraint is proposed and analyzed. Compared with...
Multiuser precoding and power allocation in downlink of cooperative CDMA networks
, Article ATC 2009 - Proceedings of the 2009 International Conference on Advanced Technologies for Communications, 12 October 2009 through 14 October 2009, Hai Phong ; 2009 , Pages 279-283 ; 9781424451395 (ISBN) ; Jafarnia, A ; Jamali Rad, H ; Sharif University of Technology
Abstract
In this paper, we study the downlink of cooperative Direct-Sequence Code Division Multiple Access (DS-CDMA) systems, where a set of Mobile Terminals (MT) cooperate with the purpose of improving their downlink communications reliability with Base Station (BS). For combating Multiple-Access Interference (MAI) as well as transferring complexity and spatial processing from the mobile terminals to the transmitter of BS, multiuser transmitter precoding is considered. In addition to multiuser precoding based on Minimum Mean-Square Error (MMSE) criterion for mitigating MAI, the proper transmission power control strategy under a fixed total power constraint is proposed and analyzed. Compared with...